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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39edacb90f8cd798d1135988e86d900ca6de2175933bf10f24f7497dda514ea3' 
  AND token = 'i61X7IT0JiilxSj/1vKq5xLkl7JxaRBG6REkaGoioDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}